Damping mechanism of transfer trolley

Abstract

The utility model provides a transfer trolley damping mechanism which comprises a rack, a coordination assembly, wheels and a damping structure, the coordination assembly is located at the bottom of the rack, and the wheels are connected to the rack through the coordination assembly; the damping structure is mounted between the rack and the coordination assembly, and a spring is arranged on the damping structure; in the running process, the coordination assembly and the damping structure act together, so that the damping stroke of the wheels forms an arc-shaped motion trail. According to the transfer trolley damping mechanism, the rack and the wheels are connected through the coordination assembly and the damping structure, through the synergistic effect of the coordination assembly and the damping structure, the damping stroke of the wheels can form an arc-shaped movement track, the damping performance of a transfer trolley is greatly improved, and then the experience feeling of a user is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a shock absorbing mechanism of a transfer vehicle. Background Art

[0002] Baby transport carts are common medical equipment. When the transport cart passes through bumpy roads, the vibrations generated will have adverse effects on the performance of the transport cart and the baby. In related technologies, in order to solve the shock absorption problem, the transport cart can usually reduce shock through the material of the casters themselves, but this method has poor shock absorption effect and poor impact buffering effect. Spring buffer shock absorption can also be added to the transport cart body, but the common spring shock absorption components have a complex structure, require installation and debugging, are inconvenient to maintain, and the shock absorption effect needs to be improved. Utility Model Content

[0003] The technical purpose of the utility model is to provide a transfer vehicle shock absorbing mechanism, aiming to solve the problem of poor shock absorbing effect of the transfer vehicle in the related technology.

[0004] In order to solve the above technical problems, the utility model is implemented as follows: a shock-absorbing mechanism for a transfer vehicle includes: a frame, a coordination component, wheels and a shock-absorbing structure, the coordination component is located at the bottom of the frame, and the wheels are connected to the frame through the coordination component; the shock-absorbing structure is installed between the frame and the coordination component, and the shock-absorbing structure has a spring; during driving, the coordination component and the shock-absorbing structure work together to make the shock-absorbing stroke of the wheel form an arc-shaped motion trajectory.

[0005] Furthermore, the shock absorbing mechanism of the transfer vehicle also includes a driving assembly connected to the wheels, and the driving assembly is fixed to the coordination assembly.

[0006] Furthermore, the coordination component includes a fixed rod fixed to the bottom of the frame and an active component connected to the bottom end of the fixed rod; the lower end of the shock-absorbing structure is connected to the end of the active component away from the fixed rod, and the upper end is connected to the frame; the driving component is fixed to the active component.

[0007] Furthermore, the active member is connected to the lower end of the shock absorbing structure through a first connecting rod, and the coordination component also includes a second connecting rod, which is connected between the upper end of the fixed rod and the upper end of the first connecting rod.

[0008] Furthermore, the coordination component includes a fixed rod, an active rod, a first driven rod and a second driven rod, and the fixed rod, the active rod, the first driven rod and the second driven rod are connected end to end in sequence to form a parallelogram linkage mechanism; the upper end of the fixed rod is fixed to the bottom of the frame, and the lower end of the shock-absorbing structure is connected to the upper end of the first driven rod; the driving component is fixed to the first driven rod through a connecting piece.

[0009] Furthermore, the middle diameter of the spring gradually decreases from the middle to both ends.

[0010] Furthermore, the frame includes a base and a load-bearing frame connected to the base, the coordination component is arranged below the base, the shock-absorbing structure is located outside the frame, and one end of the shock-absorbing structure is connected to the coordination component and the other end is fixed to the outside of the load-bearing frame.

[0011] Furthermore, a crossbeam is arranged at the upper end of the outer side of the load-bearing frame; the shock-absorbing structure also includes a telescopic rod assembly, the upper end of the telescopic rod assembly is hinged to the crossbeam, and the lower end is connected to the coordination assembly; and a spring sleeve is arranged on the outer periphery of the telescopic rod assembly.

[0012] Furthermore, the included angle between the telescopic direction of the telescopic rod assembly and the height direction is 3-10°.

[0013] Furthermore, two wheels are symmetrically arranged, and the position and quantity of the coordination components correspond to the wheels.

[0014] Compared with the prior art, the transfer vehicle shock-absorbing mechanism in the utility model has the following beneficial effects: the wheels and the frame are connected by coordinating components and shock-absorbing structures. Through the synergistic effect of the coordinating components and shock-absorbing structures, the shock-absorbing stroke of the wheels can form an arc-shaped motion trajectory, which effectively improves the shock-absorbing performance of the transfer vehicle. Through the setting of the shock-absorbing structure, a soft connection between the wheel and the frame is achieved. Compared with the traditional structure in which the wheel and the machine are hard-connected, the impact and vibration generated by the running vehicle during the walking process can be prevented from being directly transmitted to the frame through the wheel. In addition, the overall structure of the transfer vehicle shock-absorbing mechanism of the present application is simple, and the production cost and assembly cost are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a partial structural schematic diagram of the spring in the embodiment of the utility model;

[0016] Figure 2 It is a schematic diagram of the overall structure of the shock absorbing mechanism of the transfer vehicle in the first embodiment of the utility model;

[0017] Figure 3 It is a partial structural schematic diagram of the shock absorbing mechanism of the transfer vehicle in the first embodiment of the utility model;

[0018] Figure 4 It is a partial structural schematic diagram of the shock absorbing mechanism of the transfer vehicle in the second embodiment of the utility model;

[0019] Figure 5 is a schematic diagram of the working principle of the coordination component in the second embodiment of the utility model;

[0020] Figure 6 It is a partial structural schematic diagram of the shock absorbing mechanism of the transfer vehicle in the third embodiment of the utility model;

[0021] Figure 7It is a schematic diagram of the working principle of the coordination component in the third embodiment of the utility model.

[0022] In the accompanying drawings, each figure mark represents 1, frame; 11, base; 12, load-bearing frame; 121, crossbeam; 2, coordination assembly; 21, fixed rod; 22a, active part; 23a, first connecting rod; 24a, second connecting rod; 22b, active rod; 23b, first driven rod; 24b, second driven rod; 3, shock absorbing structure; 31, spring; 32, telescopic rod assembly; 4, driving assembly; 5, coupling; 6, rear wheel; 7, front wheel. DETAILED DESCRIPTION

[0023] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] Example:

[0027] like Figure 1-7As shown, in this embodiment, the shock absorbing mechanism of the transfer vehicle includes: a frame 1, a coordination component 2, wheels and a shock absorbing structure 3, the coordination component 2 is located at the bottom of the frame 1, and the wheels are connected to the frame 1 through the coordination component 2; the shock absorbing structure 3 is installed between the frame 1 and the coordination component 2, and the shock absorbing structure 3 has a spring 31; during driving, the coordination component 2 and the shock absorbing structure work together to make the shock absorbing stroke of the wheel form an arc-shaped motion trajectory.

[0028] Specifically, the transport vehicle may refer to a baby transport vehicle. By connecting the wheels and the frame 1 through the coordination component 2 and the shock absorbing structure 3, it is possible to retain only the freedom of the up and down swing. Through the setting of the shock absorbing structure 3, a soft connection between the wheels and the frame 1 is achieved. Compared with the traditional structure in which the wheels and the frame are hard connected, the shock absorbing effect is better, that is, the impact and vibration generated by the transport vehicle during the walking process can be directly transmitted to the frame 1 through the wheels as little as possible, thereby making the frame 1 more stable during the driving process.

[0029] In this embodiment, the frame 1 includes a base 11 and a load-bearing frame 12 fixed on the base 11, the coordination component 2 is arranged below the base 11, the shock-absorbing structure 3 is located outside the frame 1, and one end of the shock-absorbing structure 3 is connected to the coordination component 2, and the other end is fixed to the outside of the load-bearing frame 12. The frame 1 is used as the main body of the transfer vehicle for connecting and assembling with the coordination component 2, the shock-absorbing structure 3 and other parts, wherein the load-bearing frame 12 can be used to connect the shock-absorbing structure 3 and bear the load. The transfer vehicle in this embodiment includes two symmetrically arranged front wheels 7 and two rear wheels 6, the front wheels 7 are mainly used to control the walking direction, and the rear wheels 6 are used as the main supporting components; the position and number of the coordination component 2 correspond to the wheels. That is, the weight of the transfer vehicle is mainly concentrated in the area corresponding to the rear wheels 6, and the load-bearing frame 12 is also located at the position corresponding to the rear wheels 6. Therefore, in this embodiment, the wheels connected to the coordination component 2 can refer to the rear wheels 6 of the transfer vehicle. Specifically, the mass center (center of mass) of the vehicle is biased toward the rear wheel 6, and the distances between the center of mass and the front and rear wheels 6 are different; the distance between the center of mass and the front wheel 7 may account for six, and the distance between the center of mass and the rear wheel 6 may account for four, so the vehicle needs to add a shock absorbing mechanism to the rear wheel 6. In the specific implementation process, the load base value of the shock absorbing structure 3 can be further determined based on the distance ratio between the center of mass and the front and rear wheels 6, and by calculating the load-bearing condition of a single rear wheel 6 using a couple balance.

[0030] In the present embodiment, the transfer vehicle shock absorbing mechanism also includes a drive assembly connected to the wheel, and the drive assembly 4 is fixed on the coordination assembly 2. The drive assembly 4 can be connected to the rear wheel 6 to provide power for the rotation of the rear wheel 6. In some specific embodiments, the drive assembly 4 can include a motor and a coupling, and the motor is fixed on the coordination assembly 2, and the motor and the wheel can be connected by a coupling. Of course, in some other embodiments, the transfer vehicle can also be a hand-pushed transfer vehicle, and the rear wheel 6 is directly connected to the coordination assembly 2 by a connector, which is not limited here.

[0031] In this embodiment, a crossbeam 121 is provided at the upper end of the outer side of the load-bearing frame 12; the shock-absorbing structure 3 also includes a telescopic rod assembly 32, the upper end of the telescopic rod assembly 32 is hinged to the crossbeam 121, and the lower end is connected to the coordination assembly 2; the spring 31 is sleeved on the outer periphery of the telescopic rod assembly 32. The lower end of the shock-absorbing structure 3 can also be hinged to the coordination assembly 2, so that the shock-absorbing structure 3 can be installed so that the travel of the rear wheel 6 forms an arc-shaped motion trajectory. Further, in this embodiment, the angle between the telescopic direction of the telescopic rod assembly 32 and the height direction is 3-10°; preferably 3-6°, which is conducive to decomposing the total force F acting on a single rear wheel 6 and perpendicular to the ground into two component forces to form a force triangle; avoiding the total force F directly acting perpendicularly on the shock-absorbing structure 3, thereby reducing the load of the shock-absorbing structure 3, and also conducive to achieving a good shock-absorbing effect.

[0032] In this embodiment, when the transport vehicle passes through an uneven road section, the front wheel 7 and the rear wheel 6 are easily impacted, causing the device to shake. The shock absorbing structure 3 includes a damper and a spring 31. The shock absorbing structure 3 can reduce the vibration and impact of the mechanical equipment. The spring 31 on the shock absorbing structure 3 can absorb the ground impact and convert it into repeated rebound. The damper can suppress the repeated rebound of the spring 31, absorb the elastic potential energy, and convert it into other energy to offset it through hydraulic oil, thereby reducing the impact of vibration on the baby on the transport vehicle, improving the comfort of the baby during operation, and reducing the friction and wear of mechanical parts under vibration and impact.

[0033] In this embodiment, the middle diameter of the spring 31 gradually decreases from the middle to the two ends. That is, the spring 31 used in this embodiment can be a drum-shaped spring with a large middle and small ends. The main function of the spring 31 is to absorb impact and convert it into repeated rebound. The spring 31 will generate elastic force when subjected to load fluctuations, and the damper can absorb elastic potential energy. Figure 1As shown, the spring 31 can be designed using the design criteria of equal pitch t; according to the actual working conditions, the free height H0 and the working height of the spring 31 are determined. For example, the free height H0 can be set to 125±0.2mm; the working height can be set to 90-101.5 mm. The minimum installation center diameter R1 of the spring 31 can be 36-37mm, and R2 can be 50mm. In the specific implementation process, after the size center diameter and the working height are determined, the independent variables of the spring 31 (the effective number of turns and the wire diameter, for example, the effective number of turns can be 8-9 turns, and the wire diameter d can be 4-7 mm) can be further adjusted according to these parameters, and then the elastic force value of the spring 31 is determined to ensure that the shock absorbing performance of the shock absorbing structure 3 is optimal. It can be understood that the above parameters or parameter ranges listed in this embodiment are merely exemplary and are only used to explain the utility model, and should not be understood as limitations on the utility model. In some specific implementations, in order to ensure the working stability of the spring 31 when loaded and to ensure that the spring 31 is subjected to balanced force, the two ends of the spring need to be tightened and ground half a circle, and such a setting is also more convenient for the positioning and installation of the spring. The structural parameters of the spring 31 are designed in the above manner to achieve a soft connection between the wheel and the frame 1, which is conducive to reducing the friction and wear of mechanical parts under vibration and impact, and can effectively improve the shock absorption effect of the transfer vehicle.

[0034] like Figure 2 and 3 As shown, in the first embodiment, the coordination component 2 includes a fixed rod 21 fixed to the bottom of the frame 1 and an active component 22a connected to the bottom end of the fixed rod 21; the lower end of the shock absorbing structure 3 is connected to the end of the active component 22a away from the fixed rod 21, and the upper end is connected to the frame 1; the driving component 4 is fixed to the active component 22a. The shock absorbing structure 3 and the active component 22a can be integrally connected, or they can be assembled and fixed together by separate structures, which is not limited here. In a specific embodiment, the driving component 4 can be fixed to the active component 22a by a clamp. The active component 22a can be a sheet metal part, and a cavity can be opened on the sheet metal part. The opened cavity can be used to fix and install components such as motors in the driving component 4. That is, the frame 1 and the driving component 4 are connected as a whole through the fixed rod 21 and the active component 22a, and the fixed rod 21 in the coordination component 2 is fixedly connected to the bottom of the frame 1; so that the freedom of the coordination component 2 to move forward and backward and up and down is restricted, that is, only the freedom of the component to swing up and down is retained; one end of the shock-absorbing structure 3 is hinged to the crossbeam 121 of the frame 1, only the freedom of rotation is retained, and the other end is hinged to the end of the active component 22a away from the fixed rod 21, so that the travel of the rear wheel 6 forms an arc-shaped motion trajectory, and the shock-absorbing effect is good.

[0035] like Figure 4 and 5As shown, in the second embodiment, the active member 22a is connected to the lower end of the shock absorbing structure 3 through the first connecting rod 23a, and the coordination component 2 also includes a second connecting rod 24a, which is connected between the upper end of the fixed rod 21 and the upper end of the first connecting rod 23a. That is, the fixed rod 21, the active member 22a, the first connecting rod 23a and the second connecting rod 24a are connected end to end to form a planar four-bar mechanism, wherein the shock absorbing mechanism 3, the first connecting rod 23a and the second connecting rod 24a can be connected as a whole through a pin, and the first connecting rod 23a and the active member 22a can also be connected through a pin. Figure 5 The figure shows the schematic diagram of the shock absorption principle of the coordination component 2 when passing through a bumpy road section. The fixed rod 21 is fixed to the bottom side of the base 11, the active member 22a is used as the active rod, and the first connecting rod 23a and the second connecting rod 24a are used as the driven member; the driving component 4 is fixed on the active member 22a, and the rear wheel 6 can be fixed to the active member 22a through the coupling 5 and the driving component 4. When not loaded, the wheel axis of the rear wheel 6 will be inclined at a certain angle to the horizontal ground; the shock absorption process is that the active member swings, so that the shock absorption stroke of the rear wheel 6 forms an arc-shaped motion trajectory. The active member 22a can be a sheet metal part, and a cavity can be opened on the sheet metal part. The opened cavity can be used to fix and install the motor and other devices in the driving component 4.

[0036] like Figure 6 and 7 As shown, in the third embodiment, the coordination component 2 includes a fixed rod 21, an active rod 22b, a first driven rod 23b and a second driven rod 24b, and the fixed rod 21, the active rod 22b, the first driven rod 23b and the second driven rod 24b are connected end to end in sequence to form a parallelogram linkage mechanism; the upper end of the fixed rod 21 is fixed to the bottom of the frame 1, and the lower end of the shock absorbing structure 3 is connected to the upper end of the first driven rod 23b; the driving component 4 is fixed to the first driven rod 23b. That is, the coordination component 2 of this embodiment also forms a parallelogram linkage mechanism, the two coordination components 2 can share a fixed rod 21, and the telescopic rod component can be connected to the first driven rod 23b through a fixed block. The fixed rod 21 is fixed to the bottom side of the base 11, the active rod 22b is used as the active part, and the first driven rod 23b and the second driven rod 24b are used as the driven parts; the driving assembly 4 can be fixed at the middle position of the first driven rod 23b, and specifically, the components of the driving assembly 4 such as the motor and the coupling 5 can be fixed to the first driven rod 23b through the hexagonal studs. In this way, regardless of whether the transfer vehicle is loaded or not, the wheel axis of the rear wheel 6 is always parallel to the horizontal ground, and the wheel surface is always in contact with the ground, which is more conducive to the movement, steering and control of the frame 1 when it is not loaded, and the shock absorption effect is good.

[0037] It can be seen that no matter which of the above methods is used to set the power component, the coordination component 2 and the wheel, it is possible to retain only the freedom of the coordination component 2 to swing up and down, so that the shock absorbing stroke of the rear wheel 6 forms an arc-shaped motion trajectory, and the shock absorbing effect is good.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A shock absorbing mechanism for a transfer vehicle, characterized in that: The machine comprises a frame, a coordination component, wheels, a driving component and a shock absorbing structure, wherein the coordination component is located at the bottom of the frame, the driving component is connected to the wheels, and the wheels are connected to the frame through the coordination component; the shock absorbing structure is installed between the frame and the coordination component, and a spring is provided on the shock absorbing structure; during driving, the coordination component and the shock absorbing structure work together to make the shock absorbing stroke of the wheels form an arc-shaped motion trajectory; The coordination component includes a fixed rod fixed to the bottom of the frame and an active member connected to the bottom end of the fixed rod; the lower end of the shock absorbing structure is connected to an end of the active member away from the fixed rod, and the upper end is connected to the frame; the driving component is fixed to the active member; Alternatively, the coordination component includes a fixed rod, an active rod, a first driven rod and a second driven rod, and the fixed rod, the active rod, the first driven rod and the second driven rod are connected end to end in sequence to form a parallelogram linkage mechanism; the upper end of the fixed rod is fixed to the bottom of the frame, and the lower end of the shock absorbing structure is connected to the upper end of the first driven rod; the driving component is fixed to the first driven rod through a connecting piece.

2. The shock absorbing mechanism of the transfer vehicle according to claim 1, characterized in that: The active member is connected to the lower end of the shock absorbing structure through a first connecting rod. The coordination component also includes a second connecting rod connected between the upper end of the fixing rod and the upper end of the first connecting rod.

3. The shock absorbing mechanism of the transfer vehicle according to claim 1, characterized in that: The middle diameter of the spring gradually decreases from the middle to both ends.

4. The shock absorbing mechanism of the transfer vehicle according to claim 1, characterized in that: The frame includes a base and a load-bearing frame connected to the base, the coordination component is arranged below the base, the shock-absorbing structure is located outside the frame, and one end of the shock-absorbing structure is connected to the coordination component, and the other end is fixed to the outside of the load-bearing frame.

5. The shock absorbing mechanism of the transfer vehicle according to claim 4, characterized in that: A crossbeam is arranged at the upper end of the outer side of the load-bearing frame; the shock-absorbing structure also includes a telescopic rod assembly, the upper end of which is hinged to the crossbeam and the lower end is connected to the coordination assembly; the spring is sleeved on the outer periphery of the telescopic rod assembly.

6. The shock absorbing mechanism of the transfer vehicle according to claim 5, characterized in that: The included angle between the telescopic direction of the telescopic rod assembly and the height direction is 3-10°.

7. The shock absorbing mechanism of the transfer vehicle according to claim 1, characterized in that: The wheels are symmetrically arranged with two each, and the positions and quantities of the coordination components correspond to the wheels.

Images